<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>

const json = {
    a: { b: { c:1 } },
    d: { e: 2 },
}

const path = ['a', 'b' , 'c']

let p = json
path.forEach(k => {
    p = p[k]
})
console.log(p)

    </script>
</body>
</html>